That's probably the key to the problem. With the second monitor, illegal resolution choices are showing up on the list. That whole monitor-choice section of MA3 is Microsoft code, so it's mostly Greek to me. Maybe as it builds the list of resolutions, it's doing an OR instead of an AND - like this: "If this resolution is good for Monitor 1 OR Monitor 2, then put it on the list."
I'll look at it, and see if anything obvious jumps out at me.
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